National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Sparta, Sparta / Fort McCoy Airport (KCMY)

Lat: 43.96°NLon: 90.74°WElev: 837ft.

Fair

96°F

36°C

Humidity 41%
Wind Speed NW 13 G 20 mph
Barometer 29.63 in (1002.9 mb)
Dewpoint 69°F (21°C)
Visibility 10.00 mi
Heat Index101°F (38°C)
Last update 27 Jul 2:55 pm CDT
Extended Forecast for

3 Miles ENE Ontario WI

Extreme Heat Warning July 27, 03:07pm until July 27, 09:00pm
Click here for hazard details and duration
...
  •  
    Extreme Heat Warning July 27, 03:07pm until July 27, 09:00pm

    NOW until 9:00pm Mon

    Extreme Heat Warning

  • Tonight

    Low: 63 °F

    Patchy Smoke
    then Partly
    Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 86. Northeast wind 5 to 7 mph becoming calm in the afternoon.

    High: 86 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 62. Calm wind.

    Low: 62 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 87. Calm wind.

    High: 87 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 66. Calm wind.

    Low: 66 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 88. Calm wind becoming southwest around 5 mph in the afternoon.

    High: 88 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A 30 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 66. Light south wind.

    Low: 66 °F

    Mostly Cloudy
    then Chance
    T-storms

  • Friday

    Friday: Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 80. Light south wind. Chance of precipitation is 60%.

    High: 80 °F

    Showers
    Likely

Detailed Forecast

Tonight
Patchy smoke before 8pm. Increasing clouds, with a low around 63. Northwest wind 8 to 14 mph becoming northeast after midnight. Winds could gust as high as 23 mph.
Tuesday
Mostly sunny, with a high near 86. Northeast wind 5 to 7 mph becoming calm in the afternoon.
Tuesday Night
Mostly clear, with a low around 62. Calm wind.
Wednesday
Sunny, with a high near 87. Calm wind.
Wednesday Night
Mostly clear, with a low around 66. Calm wind.
Thursday
Mostly sunny, with a high near 88. Calm wind becoming southwest around 5 mph in the afternoon.
Thursday Night
A 30 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 66. Light south wind.
Friday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 80. Light south wind. Chance of precipitation is 60%.
Friday Night
Showers likely and possibly a thunderstorm before 1am, then a chance of showers. Mostly cloudy, with a low around 63. Light and variable wind. Chance of precipitation is 60%.
Saturday
A slight chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 82. Calm wind becoming north around 6 mph in the afternoon. Chance of precipitation is 20%.
Saturday Night
Mostly clear, with a low around 61. Light and variable wind.
Sunday
Sunny, with a high near 84. Light northeast wind.
Sunday Night
Mostly clear, with a low around 60. Calm wind.
Monday
Sunny, with a high near 85. Calm wind becoming south around 6 mph in the afternoon.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles ENE Ontario WI
 43.73°N 90.55°W
Last Update:
1:46 pm CDT Jul 27, 2026
Forecast Valid:
3pm CDT Jul 27, 2026-6pm CDT Aug 3, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation